<!DOCTYPE html>
<html lang="en">
  <head>
    <meta charset="UTF-8" />
    <meta name="viewport" content="width=device-width, initial-scale=1.0" />
    <title>Document</title>
    <style>
      body {
        background-color: aquamarine;
      }
      .water {
        position: relative;
        width: 300px;
        margin: 0 auto;
        margin-top: 200px;

        height: 300px;
        border-radius: 42% 58% 77% 23% / 40% 31% 69% 60%;
        box-shadow: inset 10px 20px 30px rgba(0, 0, 0, 0.5),
          inset -10px -10px 15px rgba(255, 255, 255, 0.8),
          10px 10px 20px rgba(0, 0, 0, 0.3), 15px 20px 30px rgba(0, 0, 0, 0.05);
      }
      .water::before {
        content: "";
        width: 20px;
        height: 20px;
        position: absolute;
        top: 22%;
        left: 48%;
        background-color: rgba(255, 255, 255, 0.8);
        border-radius: 51% 49% 35% 65% / 40% 54% 46% 60%;
      }
      .water::after {
        content: "";
        width: 10px;
        height: 10px;
        position: absolute;
        top: 28%;
        left: 37%;
        background-color: rgba(255, 255, 255, 0.8);
        border-radius: 51% 49% 35% 65% / 59% 54% 46% 41%;
      }
    </style>
  </head>
  <body>
    <div class="water"></div>
  </body>
</html>

